Navistar MaxxForce 15 - Engine Specifications; Engine Description

ENGINESYSTEMS9
EngineSpecications
MaxxForce®15DieselEngine
EngineConguration4stroke,inlinesixcylinderdiesel
Advertisedbrakehorsepower@rpmSeeEPAexhaustemissionlabel
Peaktorque@rpmSeeEPAexhaustemissionlabel
Displacement
15.2L(928in
3
)
Compressionratio
16.0:1
Stroke171.5mm(6.75in)
Bore(sleevediameter)137.2mm(5.40in)
Engineweight(dry,withouttrimoraccessories)1429kg(3,150lbs)
Firingorder1-5-3-6-2-4
Enginerotation(facingywheel)Counterclockwise
Aspiration
DualturbochargedandChargeAir
Cooled(CAC)
Combustionsystem
Directinjectionturbocharged
FuelsystemHigh-pressurecommonrail
Lubesystemrellcapacity(includinglter)
•Gravitydrainfromrightrearandbottomfrontsumpplugs38L(40qts)
•Suctionoilrecoveryoption34.5L(36.5qts)
Enginelubricationoilpressureat99°C(210°F)
•600rpm
•1,600rpm
Minimum83kPa(12psi)
275-550kPa(40-80psi)
Idlespeed(noload)
600rpm,nominal
Thermostattransitionrange(startopen—fullopen)88°C-103°C(190°F-217°F)
EngineDescription
TheMaxxForce®15dieselenginehasbeendesigned
forincreaseddurabilityandreliability.
Thecylinderheadhasfourvalvespercylinderwith
centrallylocatedfuelinjectorsdirectingfuelover
thepistons.Thiscongurationprovidesimproved
performanceandreducesemissions.
Theoverheadcamshaftissupportedbyseven
bearingsinthecylinderhead.Thecamshaftgearis
drivenfromthefrontoftheengine.Theoverhead
valvetrainincludesrollerrockerarmsanddualvalves
thatopenusingavalvebridge.
TheMaxxForce®15engineusesonepieceforged
steelpistons.Coolingjetcutoutsandfeedholesare
placedonbothsidesofthepistons.Pistonsmay
beinstalledineitherdirectionhoweverpistonsare
originallyinstalledwithcastingbumponbottomofpin
bosstowardrearofengine.
Theonepiececrankcasecanwithstandhigh-pressure
loadsduringoperation.Thecrankcaseuses
replaceablewetcylindersleevesthataresealedbya
systemofthreeO-rings.
Soundshieldsarestrategicallyplacedontheengine
toreducenoise.